refactor(desktop): convert main process to Effect-TS

[Brendonovich]

Summary

Refactors the desktop main process to use Effect-TS for improved composability and error handling.

Changes

• Extracted auto-updater logic into a new updater.ts module
• Converted main process initialization to Effect-TS (Effect.gen, Deferred, Fiber)
• Replaced manual promise/deferred patterns with Effect primitives
• Improved sidecar health check timeout handling via Effect.timeout
• Cleaned up initialization flow and removed dead code (delay, defer, sqliteFileExists, getSidecarPort)

2 files changed, 362 insertions(+), 370 deletions(-)